Hi George,
I’m running ATF on an iMac using VMFusionWare running Windows 7; I have no idea if W8 runs ATF but I haven’t received any complaints. Try it out and let me know how it goes!

Also – the ATF counters are the same between TRC3 and TRC4, and there are only two trivial map changes, so I recommend you download the update. TRC3 is 38+ years old at this point, the main differences with TRC4 are really the rules.